This is a puzzle with 9! possibilities and 336 solutions. The problem posed in 9 digits consists in the organization of the numbers 1 to 9 in a square of 3 * 3 to make the sum of the numbers of the fi...More: lessons, discussions, ratings, reviews,...

Puzzle with 9! possibilities and 336 solutions. The problem posed in Ninedigits workshops consists in the organization of the numbers 1 to 9 in a square of 3 * 3 to make the sum of the numbers of the...More: lessons, discussions, ratings, reviews,...

This is an Excel spreadsheet that implements a game similar to the card-based 24 Game by Suntex International Inc. The game presents four digits at random. The challenge is to devise a numerical exp...More: lessons, discussions, ratings, reviews,...

The object of this game is to fill the whole addition table with the numbered tiles. Users can pick up and drag each tile to its correct cell with the mouse. If the cell in the table is clicked, its a...More: lessons, discussions, ratings, reviews,...

Bingo is a well known game that can be a lot of fun. In the traditional game, the numbers are called out by the Bingo caller. This game is similar but the numbers are 'called out' by answering the div...More: lessons, discussions, ratings, reviews,...

The Mental Addition and Subtraction module can be used as a starting point for: learning different methods of mental addition and subtraction. Linked resources include factsheets, games, quizzes, and ...More: lessons, discussions, ratings, reviews,...

Second level in a set of three Number Triangle activities. They are an electronic version of flash cards emphasizing fact families. An addition/subtraction Number Triangle has two addends and a sum; a...More: lessons, discussions, ratings, reviews,...

Third level in a set of three Number Triangle activities. They are an electronic version of flash cards emphasizing fact families. An addition/subtraction Number Triangle has two addends and a sum; a ...More: lessons, discussions, ratings, reviews,...

The Times Table module can be used as a starting point for learning a particular table; a reinforcement of number patterns and tables already covered; and practicing knowledge of tables. Linked resour...More: lessons, discussions, ratings, reviews,...

This app develops quick mental math skills for elementary and middle grades students. To begin, you have a puzzle board that looks like a Sudoku puzzle filled in. In each square of 9 numbers, 2 of the...More: lessons, discussions, ratings, reviews,...

This material is based upon work supported by the
National Science Foundation under Grant DUE-0226284.
Any opinions, findings, and conclusions or recommendations
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National Science Foundation.